桩基施工对边坡黏土强度参数影响试验研究  

Experimental study of influence of pile foundation construction on slope clay strength parameters

作　　者：张清桃 刘绪洋 ZHANG Qingtao;LIU Xuyang(School of Civil Engineering,Chongqing Jiaotong University,Chongqing 400074,China;China Construction Tunnel Construction Co.Ltd.,Chongqing 400074,China)

机构地区：[1]重庆交通大学土木工程学院,重庆400074 [2]中建隧道建设有限公司,重庆400074

出　　处：《南昌工程学院学报》2018年第3期29-33,共5页Journal of Nanchang Institute of Technology

摘　　要：桩基施工过程中产生的持续较大的振动对引起土体累计变形和超静孔压增大,引起土体强度降低。以某库岸边坡为背景,进行现场振动测试。根据振动产生的动应力特征,采用静、动三轴试验对土单元体原位应力状态进和应力路径进行模拟,并提供了试验方法及结果。最后分析了土的强度在施工期间动应力作用下的折减,建议强度折减系数取0.7~0.8。The continuous large vibration generated during the construction of the pile will cause the soil to accumulate deformation and increase the excess pore pressure,and cause the soil strength to decrease. Taking the slope of square as the background,we conduct a live vibration test. According to the dynamic stress generated by vibration,the in-suit stress state and stress path of soil element are simulated by static dynamic triaxial tests,and then we provided the test method and results. Finally the reduction of soil strength under dynamic stress during construction is analyzed,which suggests that the strength reduction coefficient is 0. 7 ~ 0. 8.

关 键 词：边坡桩基 黏土强度 应力组合 静动力试验 

分 类 号：TU43[建筑科学—岩土工程]